MCMedicalCodingSoftware
Q66.3

Q66.3: Other congenital varus deformities of feet

Non-billable headerICD-10-CM

Q66.3 is a non-billable header ICD-10-CM code for other congenital varus deformities of feet. It cannot be billed on its own: choose one of the more specific child codes below.

Inclusion terms

Alternative wordings a physician may use in the chart for this same code.

  • Hallux varus, congenital

Excludes1 inherited from the categories above Q66.3

A category’s note binds every code beneath it.

Written on Q66: Congenital deformities of feet

  • reduction defects of feet (Q72.-)
  • valgus deformities (acquired) (M21.0-)
  • varus deformities (acquired) (M21.1-)

Other codes that can never be billed with Q66.3

Their own Excludes1 notes name this code, so the conflict is not listed above.

  • M20Acquired deformities of fingers and toes

Risk adjustment

No CMS-HCC V28 category: this code does not change a RAF score.

Code history

Unchanged in every release from FY2024 to FY2027.

Code to one of these instead Q66.3

3 child codes. Green means billable.

Other codes under Q66

ICD-10-CMFY2027· effective October 1, 2026

Loaded directly from the CMS/NCHS ICD-10-CM public-domain release: see data sources and our editorial policy. If this page disagrees with the CMS tabular list, this page is wrong. Reference information for professional coders; not medical or billing advice.